Beefy Boxes and Bandwidth Generously Provided by pair Networks
go ahead... be a heretic
 
PerlMonks  

Re^2: Finding missing record between 2 files ?

by RMGir (Prior)
on Jan 06, 2011 at 12:52 UTC ( #880812=note: print w/ replies, xml ) Need Help??


in reply to Re: Findding missing record between 2 files ?
in thread Findding missing record between 2 files ?

(fixed typo in subject)

As long as the files aren't large, that's fine, except that you're not finding keys present in file B but not in file A.

You're using 2 hashes where one would suffice, so you can cut your memory usage in half.

Pseudo code:

Process File A contents and store in %hash_one while(<FileB>) { # do whatever you need to to compute $key if (! exists $hash_one{$key}) { print "File B contains $key but File A does not\n"; } delete $hash_one{$key}; } # the keys left in %hash_one weren't in File B foreach(keys %hash_one) { print "File A contains $key, but File B does not\n"; }

Mike


Comment on Re^2: Finding missing record between 2 files ?
Download Code

Log In?
Username:
Password:

What's my password?
Create A New User
Node Status?
node history
Node Type: note [id://880812]
help
Chatterbox?
and the web crawler heard nothing...

How do I use this? | Other CB clients
Other Users?
Others drinking their drinks and smoking their pipes about the Monastery: (8)
As of 2015-07-07 11:37 GMT
Sections?
Information?
Find Nodes?
Leftovers?
    Voting Booth?

    The top three priorities of my open tasks are (in descending order of likelihood to be worked on) ...









    Results (88 votes), past polls